/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate licenses this file
 * to you under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.  You may
 * obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.execution.dsl.phases;

import com.google.common.collect.ArrayListMultimap;

import java.util.Collection;
import java.util.Map;

public final class NodeOperationGrouper {

    private NodeOperationGrouper() {
    }

    public static Map<String, Collection<NodeOperation>> groupByServer(Iterable<NodeOperation> nodeOperations) {
        ArrayListMultimap<String, NodeOperation> byServer = ArrayListMultimap.create();
        for (NodeOperation nodeOperation : nodeOperations) {
            for (String server : nodeOperation.executionPhase().nodeIds()) {
                byServer.put(server, nodeOperation);
            }
        }
        return byServer.asMap();
    }
}
